Wiring Method of DC High Voltage Generator
1. First check whether the DC high voltage generator operating box and pressure tube are intact, and the AC220V power cord and wiring cable should not be open or short-circuited.
2. Connect the operating box and the pressure cylinder with the special cable, while keeping the interval of the remaining fuse, then connect to the test arrester or other loads, and also connect the discharge rod and grounding wire.
3. After reviewing and confirming the correctness of the entire circuit connection, perform the following no-load test.
4. Set the power switch of the DC high voltage generator to the "off" position, turn the high voltage output adjustment knob clockwise, turn off the power switch, the meter appears, press the closing knob, hear a "bang" sound, and the signal relay closes, with a slight oscillation sound, then slowly adjust the output knob counterclockwise to adjust to the required voltage value.
Overvoltage protection performance: To ensure that the machine is not damaged during the test, when the load voltage exceeds the extra output voltage of each machine, overvoltage protection can be used to prevent equipment damage. After the first connection as required, cut off the test sample, raise the temperature to the required no-load protection voltage value, quickly adjust the overvoltage protection button, and continuously generate protection for each machine. When the overvoltage indicator light of the DC high voltage generator turns on, turn the output adjustment knob back to zero. Cut off the power, keep discharging on the line test, and then proceed with the heating experiment.
Overcurrent protection performance: During user operation experiments, to prevent damage to each machine, when the load current exceeds the extra output current of each machine, overcurrent protection action is taken, high voltage has no output, and the overcurrent indicator light turns on. At that time, the high voltage and power should be lost.
Using the 0.75U1mA key: When the high voltage current reaches 1mA, the left voltmeter reading is U1mA. Press the 0.75U1mA key, the right voltmeter reading immediately returns to 0.75U1mA, then adjust the voltage adjustment knob clockwise to make the voltage values of the two meters the same. At this time, the milliammeter reading is the leakage current at 0.75U1mA voltage.
5. After the no-load test, the DC voltage and leakage current of the test sample can be tested. According to the conventional high voltage test sequence, if protective measures still require heating, the power must be cut off first, and then repeat the method of cutting off the power.
6. When conducting capacitive load experiments, due to the charging process of the capacitor, the temperature rise process is not fast, so as to avoid the output voltage exceeding the additional value and damaging the sample.
7. At the end of the experiment, the high voltage output adjustment knob of the DC high voltage generator must be turned back to zero to block the flow source. After raising the high voltage position, release the residual point charge through the discharge rod, and remove the experimental wiring.
